Chuck



July 31, 1923. I 1,463,176

G. K. SCHIELDGE CHUCK f Filed June 211922 2 sheetsfsheet 1 f4. Il

Patented July 3l., l923.

till steil suono-n K; scHrnLpen, or Henfr'roap, oonnncrrcu'r, .essrononyro Trrnnenrronp SPECIAL MACHINERY coureur', or nearrroiap,oonuno'rrour, A CORPORATION 0F CONNECTICUT. v

CHUCK.

Application filed June 21, 1922. Serial o. 569,895.

To c//ZZ whom t may concern:

Be it known that l, Gnonon l. SCHIELDGE, a citizen of the UnitedStates', residing at Hartford, in the county of Hartford and State ofConnecticut, have invented a new and useful Improvement in Chucks, ofwhich the following is a specification.

This invention relates to the construction of a chuck of the collettype, 'that is, a chuck in which the holding jaws are formed integralwith or `are attached to spring Shanks that are connected. with rasleeve which when moved in lone direction in the body of t-he chuckcauses the jaws to engage with the taperingT wall of an opening and beclosed thereby, and' which when moved in the opposite direction carriesthe jaws away from the tapering wall and permits them to spring open.The constriction and expansion of collet aws is slight consequently thecommon forms of this typeof chuck are quite limited as to the sizes andthe character of the pieces which they will hold.

The object of the present invention is to provide a chuck of thischaracter having means whereby it can be easily operated for tightlygripping#l and releasing the work7 and which is so organized that it maybe set up for holding a. tool or small work such as wire. rods or tubeswhich are to be turned or drilled, or it may be setup for holdingv workof much greater diameter such as plates or disks the faces of which areto be operated upon.

This object is attained by so forming the body7 which has readilyassembled and easily operated means for advancing and retarding thecollet, that it may be supplied with a small collet having: grippingjaws that will extendv some distance along a length of rod or toolshank, or may be supplied with a larger collet having step gripping jawsthat will extend about the edges of a plate or blank, both typesofcollets being engaged with and advanced by the operating mechanism inthe same way7 whereby the capacity and usefulness of vthese chucks isgreatly increased' at a minimum expense.

Figure l of the accompanying drawings shows a longitudinal section of achuck which is constructed to attain vthe object of the invention,provided with the small type of tool or rod holding collet. Fig. 2 showsa longitudinal section of the chuck set up vand provided with the largeVplate-'holding step collet. 3 shows an end view ofthe the small collet.'Fig. t shows a side vi ew of the small collet.v v 5 shows` an end viewof the large collet. Fig. 6 shows a side view of the large collet. Fig'.7 `is a section of the" removable member which is appliedito the` alarge collet is to 1 body of the. chuck when be used.

The body l of the chuck hasa `centr-al i opening?l `with an enlargedrecessv 3 at the rear. At the front within the tapering nose ofthe bodythe central recess .is conical so as to provide the conical jaw closingwall Atthe back the body is usually provided with a sleeve 6 by means ofwhichv the chuck may be attached to the spindle or arbor of a lathe,drill'press or other machine tool withV which `it is to 'be used. In therecess Sin the body is a nut 7. In the type ofchuck illustrated theperiphery'of this nut is provided with a V- V shaped groove 8 and thebody adj-acont thereto is provided with `a 'll-shaped groove 9. Balls 10are placed in these grooves for retaining the nut in position with aminimum amount ot friction.v The balls are in serted into the race-waythusv provided through the opening' occupied bythe screwl 1l. 0n theforward face `of the nutvare gea-r teeth l2 which are adapted to beengaged by a key thrust into the socket .13 for-ifotating the nut.Packing washers 14 and l5 may be placed each side of the ball race forkeeping lubricant therein. At the base of the taperthread 16.

ing nose 4 of the body is an exterior screw collet and is moreparticularly ldesigned for` I gripping tools, rods tubes orstudls, hasjaws 18 with. inclined backs. which jaws are con-y nected by springshanks 19iwith a band 2O` that is exteriorly threaded to lit the threadsin the interior of the nut 7. 'When thenut is turned in one directionthe collet is drawny into the opening in the body and the `engagement ofthe.' outer surfaces or. backs of the collet jaws with the inclined wall5 of the conical opening in the body causes the jaws to be contracted.turned in the other direction the collet is expand.

When thenutnis`r i carried outward andthe jaws permitted to,l

To use the chuck. for holding` work of n l greater diameter than ispossible with the collet 17, the collar 2l is unscrewed 'from the threadat the base of the nose. This collar performs no mechanical functionother than to protect the vthread when the small collet is being` used.ritter the collar has been reinoved the body extension vmember 22screwed upon the main body7 this member having an internal thread 23which lits the thread at the base ot' the'nose. The body extension has aconical openingY 24 shaped to lit the tapering nose 4- of the body and`it has conical openirggwith a tapering1 jaw closing` wall 25 at itsouter end. lllhen this member has been screwed to position the collet isinserted into the bdy fin-'l the exterior thread on the band 1J. 1 itsinner end is engaged with trie thread The ban-Sl of this collety isconnected by spring shanls 2S with the 29 whi-.fih in their have anumber ot cesses9 as 30, 3l and 8S. With tl collet when the nut isturned. in one the tapering; backs ot' the jaws e the conical wall 25 inthe opening in tl body extension and the jaws rre contracted. When thenut is turned in t ie opposite dire- ,tionv the collet is pushed out andthe jaws permitted to expand. A pin may be placed in the body extensionin such .ma-nner as to project into a soclret 3l in the liafl ot one otthe collet jaws so as to mei/'ent the collet from turning)` when itdrawn in or pushed out.

Collets having different interior or e ippingg diameters, oit course,are provided ror these chucks. lith a collet ot the type shown in Fig.l7 a tool shank7 or a rod, or tube or other pieces of relative-ly smalldiameters can be easily clamped by the jaws isv in such manner as to betightly held, for the gripping` surfaces of the jawson the work arelong' and the wedgging` suri'aces ot the bacls ct the jaws against theconical wall in the body are extended. As stated, with collets oit thistype the capacity or usefulness olz the chuck is limited. llowover theprovision ot the removable body extension greatly increases the capacityof the chuclr, or collets ot the type shown in Fig. 2 may have a numberot steps in the jaws which will hold various sizes and shapes et work otvery much greater diameter than can be held by the type of collet shownin l?! l. ris result of this invention a user need have but a singlebodyj and if provided with the body extension he may quickly set up thechuck. ttor holding` small or large pieces or' work various character,therefore at a minimum expense to user the capacity or range ci? a chuclof the collet type is largely increased.

The invention claimed is:

Chuckinp; means comprising a body haying an oi'ieninp; with a `conicaljaw clos-.ngwall, a body extension detachably mounted on the body, saidextension havingv an open ing with a conical jaw closing' wall.7 saidchuc-lrinp; means being` adapted to receive lectiyely. eitheir a colletharing spring` jaws adapted to lit theconical jaw closing` wall in thebody. or acollet hai/*ing* spring jaws adapted te fit the conical jawclosing wall in the body extension, a nut rotatable within the body, andmeans Vtor rotating' the nut. said collets having; threaded shanksadapted to fit the thread in said nut, whereby the chuclrinp; means maybe used tor holding; relatively small pieces or may be used for holdingrelatively large pieces.

GEORGE l. SCHELDGE.

